UN Support Mission in Libya (UNSMIL) on Sunday called for an immediate investigation into the killing of 36 people near the eastern city of Benghazi.
"UNSMIL calls for immediate investigation to bring perpetrators to justice," the mission said on social media on Sunday.
"UNSMIL condemns in the strongest terms the heinous crime resulting in the killing of at least 36 whose bodies found in Abyar area," the mission said.
The eastern-based army command on Saturday issued orders to open an urgent investigation into the incident.
Residents of the town Abyar, 50 kilometers southwest of Benghazi, reported the discovery of 36 unidentified bodies with bullet marks in a deserted area, according to a military source.
In July 2016, 14 bodies of handcuffed people were found near the headquarters of Benghazi's Social Security Fund.
In October 2016, 10 unidentified bodies with marks of torture and bullets were discovered in Benghazi's military prison.
